address merwok's comments

Author: nedbat

Doc/library/intro.rst

@@ -5,9 +5,9 @@ Introduction
 ************
 
 The Python standard library consists of a collection of modules. There are
-many ways to dissect this collection.  Some modules are written in C and compiled
-into the Python interpreter; others are written in Python and imported in
-source form.  Some modules provide interfaces that are highly specific to
+many ways to dissect this collection.  Most modules are written in Python,
+but some are written in C. All can be imported into your program to add
+functionality.  Some modules provide interfaces that are highly specific to
 Python, like printing a stack trace; some provide interfaces that are specific
 to particular operating systems, such as access to specific hardware; others
 provide interfaces that are specific to a particular application domain, like
@@ -25,7 +25,7 @@ function, module or term in the index (in the back).  And finally, if you enjoy
 learning about random subjects, you choose a random page
 and read a section or two.  Regardless of the order in which you
 read the sections of this manual, it helps to first read
-:ref:`built-in-funcs` in :ref:`builtins-index`, as the remainder of this section
+:ref:`built-in-funcs`, as the remainder of this section
 assumes familiarity with this material.
 
 .. seealso::